Question 9 of 16 For each of the following cases, identify the order with respec

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Question 9 of 16 For each of the following cases, identify the order with respect to the reactant. Case (A products) Order Number The half-life of A decreases as the initial concentration or A decreases. Number A twofold increase in the initial concentration of A leads to a fourfold increase in the initial rate. Number A twofold increase in the initial concentration of A leads to a 1.41-fold increase in the initial rate. Number The time required for [A] to decrease from [Alo to [Alo/2 is equal to the time required for [A] to decrease from [Ao/2 to [Alo/4. Number The rate of decrease of [AJ is a constant. Previous ® Give Up & View Solution Check Answer 0 NextExit Hint

Explanation / Answer

A)

if half life if dependent on initial reaction, then this is either zero or second order

HL (2nd) = 1/([A0]k) therefore Half life will icnrease as time passes by

for HL (zero) = [A]0/2k

then, if we decrease [A]0 , then hlf life decrease, this must be ZERO ORDER

b)

if 2x increase, then rate = 2x

RatE = k*[A]^2

since 2x = 4x kept ratio

this is 2nd order

c)

2x of A, increases .141 increase in Rate

ln(1.41) / ln(2)

this must be 1/2 order, or 0.5

d)

if half life is the same, then this must be FIRST order

e)

if [A] is constant, then, by definition

Rate = k

this is ZERO order

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